battle of britain class locomotives

For wild animals, showing teeth doesn't imply smiles on the camera and photographers. The only reason for their exposing teeth is because face-up with brutal situation leading to battles for food, dating mate and territory. These fightings are always very intense but it shows how nature occasionally works and indicates view of cruel life. The black exhaust Black seems to be a depressing color. The reason must be rich mixture. That is to say, the amalgamation of gas in cylinder component is at night normal level. The incomplete combustion gas inside combustion chamber result in the carbon particle exhausted with the waste gas. Failure is likely to come from the following reason: